Insights for diastereoselective synthesis of cyclic α-sulfinyl and sulfanyl oximes
摘要:
The comparison in several reaction conditions for synthesis of nonracemic alpha-methylsulfinylation of 3,4-dihydronaphthalen-1(2H)-one was achieved. The sulfanylation reactions of 3,4-dihydronaphthalen-1 (2H)-one-O-methyloxime and 2-(methylsulfinyl)-3,4-dihydronaphthalen-1(2H)-one-O-methyloxime by homogenous reaction medium are reported. The products were obtained in good yields and de. The yields, diastereoselectivity and theoretical calculations to all obtained compounds to support the experimental data are compared and discussed. (C) 2017 Elsevier Ltd. All rights reserved.
Iridium(III)-Catalyzed Direct Arylation of C–H Bonds with Diaryliodonium Salts
作者:Pan Gao、Wei Guo、Jingjing Xue、Yue Zhao、Yu Yuan、Yuanzhi Xia、Zhuangzhi Shi
DOI:10.1021/jacs.5b06758
日期:2015.9.30
arylation of complex compounds. Mechanistic studies by density functional theory calculations suggested that the sp(3) C-H activation was realized by a triflate-involved concerted metalation-deprotonation process, and the following oxidation of Ir(III) to Ir(V) is the most favorable when a bistriflimide is contained in the diaryliodonium salt. Calculations indicated that both steps are enabled by initial anion
Room-Temperature C–H Arylation: Merger of Pd-Catalyzed C–H Functionalization and Visible-Light Photocatalysis
作者:Dipannita Kalyani、Kate B. McMurtrey、Sharon R. Neufeldt、Melanie S. Sanford
DOI:10.1021/ja208068w
日期:2011.11.23
This communication describes the development of a room-temperature ligand-directed C-H arylation reaction using aryldiazoniumsalts. This was achieved by the successful merger of palladium-catalyzed C-H functionalization and visible-lightphotoredoxcatalysis. The new method is general for a variety of directing groups and tolerates many common functional groups.
A rhodium(III)-catalyzed C–H allylation of (hetero)arenes by using 2-methylidenetrimethylene carbonate as an efficient allylic source has been developed for the first time. Five different directing groups including oxime, N-nitroso, purine, pyridine, and pyrimidine were compatible, delivering various branched allylarenes bearing an allylic hydroxyl group in moderate to excellent yields.
Ru(II)-catalyzed chelation-assisted highly regioselective C8-hydroxylation of 1,2,3,4-tretrahydroquinolines has been developed. Various 1,2,3,4-tetrahydroquinolines underwent smooth C8–H hydroxylation with cheap and safe K2S2O8 as the oxidant and oxygen source to furnish the corresponding products in good to excellent yields with high tolerance of the functional groups. The choice of a readily installable
已经开发了Ru(II)催化的1,2,3,4-四氢喹啉的螯合辅助的高区域选择性C8-羟基化反应。各种1,2,3,4-四氢喹啉经过顺畅的C8–H羟基化反应,并以廉价且安全的K 2 S 2 O 8作为氧化剂和氧源,以高收率和高官能度耐受性提供了相应的产品。选择易于安装和拆卸的N-嘧啶导向基团是催化的关键。机理研究表明六元钌循环中间体参与了催化循环。该方法还可以扩展到其他(杂)芳烃CH键的直接羟基化反应。
Rhodium(III)-Catalyzed Direct CH Olefination of Arenes with Aliphatic Olefins
A rhodium(III)‐catalyzed direct ortho CH bond olefination of arenes, including but not limited to benzamides, arylpyridines and indoles, with a variety of unactivated aliphatic olefins has been developed. In the presence of catalytic amounts of dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer [Cp*RhCl2]2}, copper(II) acetate monohydrate [Cu(OAc)2⋅H2O] and silver hexafluoroantimonate(V) (AgSbF6)